Nuclear War of 199X (199X年の核戦争 senkyū-hyakukyūjū-ekkusu-nen no kakusensō?)
The global nuclear war that was responsible for setting the scene for the apocalypse. It was fought between an unknown number of nations, but eventually consumed the entire Earth. The Colonel explains to Kenshiro that it was started by the General.

Ryuken Gaiden - The Judgement DayEdit

In the one-shot story Ryuken Gaiden, Jagi attacks a military base with his biker gang and the ensuing chaos leads to nuclear warfare.